How can a function receive data randomly or generate random data as entry?

HI. I am looking for a function which I can enter data randomly or create a random data as a entry.

I work on text steganography in picture with MATLAB. I hope you can help me.

[Image Analyst]

What do you mean by "inter"? And I have never ever heard of the word "intery".

Is ITER a word?

noun (Anat.) A passage; esp., the passage between the third and fourth ventricles in the brain; the aqueduct of Sylvius.

See my file exchange for how to encode text into an image:

https://www.mathworks.com/matlabcentral/fileexchange/54155-encoding-text-into-image-gray-levels?s_tid=srchtitle

[DGM]

Are you just looking for something to generate random text?

If so, a very basic method would be

randtext = char(randi([32 122],[1 10]))

Otherwise, you can choose a subset of those characters.

[wafa suresh]

sorry and thank you, @Image Analystit was a typo and it was corrected.

[wafa suresh]

thanks a lot @DGM

[Walter Roberson]

https://case.edu/artsci/math/singer/Sage%204/ngram-frequency.html has tables that can make random generation more realistic.

[wafa suresh]

Thanks Mr. Roberson, but I do not work on frequencies.

I use LSB for Steganography of text in the image.

I am looking for a function that can receive data from input randomly.

[Walter Roberson]

You said

"I am looking for a function which I can enter data randomly or create a random data as a entry ."

Frequency tables can be useful in producing random text that looks more realistic.

[wafa suresh]

Yes that's right

I confused this with the issue of frequenc in images.

I'm really sorry, Because I have never used this table.

I have been using matlab software for my dissertation for a short time and I'm not very familiar with matlab functions.

thanks for your Tips.

[Walter Roberson]

Example:

Lets = [' ', 'a':'z'];
Letfreq = [200, 82, 15, 28, 43, 130, 22, 20, 61, 70, 2, 8, 40, 24, 67, 75, 19, 1, 60, 63, 91, 28, 9, 24, 2, 20, 1];
nLet = length(Lets);
Tab = cell2mat( arrayfun(@(K) repmat(Lets(K), 1, Letfreq(K)), 1:nLet, 'uniform', 0) )

Tab = '                                                                                                                                                                                                        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbccccccccccccccccccccccccccccdddddddddddddddddddddddddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeffffffffffffffffffffffgggggggggggggggggggghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiijjkkkkkkkkllllllllllllllllllllllllllllllllllllllllmmmmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooopppppppppppppppppppqrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssstttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttuuuuuuuuuuuuuuuuuuuuuuuuuuuuvvvvvvvvvwwwwwwwwwwwwwwwwwwwwwwwwxxyyyyyyyyyyyyyyyyyyyyz'

rword = Tab(randi(length(Tab), 1, 100))

rword = 'mn se donoidfgms bdplk n kbeoadadd  roh a lew bpiernlohtnei ncoirlegye elow lsrnah nnuan arblt eoccs'

In theory, the above is more "natural" than if you had randomly selected from 'a' to 'z' equally. But using frequencies for pairs of letters would improve it a lot.

[wafa suresh]

Thank you so much for this example, I will test.

[Scott MacKenzie]

For what it's worth, here's something I put together to demonstrate @Walter Roberson's comment on "pairs of letters" -- that the message will look more natural if each letter is selected considering its probability of following the previous letter. Indeed, the output looks more natural (i.e., more like English).

df = readcell('digram.txt'); % digrams+frequencies, sorted by digram
n = size(df,1); % 27x27 = 729

letters = cellfun(@(x) x(1), df(1:27:length(df(:,1)),1));
letterFreq = (sum(reshape(cell2mat(df(:,2)), 27, [])))';
csLetterFreq = [1; cumsum(letterFreq)];

diagrams = char(df(:,1));
diagramFreq = cell2mat(df(:,2));
csDigramFreq = cumsum([ones(1,27); reshape(cell2mat(df(:,2)),27,[])]); 

tot = sum(letterFreq); % total frequency (~300 million)

% create random message (begin with random letter selected as per letter freq)
message(1) = letters(find(randi(tot) <= csLetterFreq, 1));
for i=2:100        
    idx1 = find(message(i-1) == letters); % previous letter idx    
    idx2 = find(randi(csDigramFreq(end,idx1)) <= csDigramFreq(:,idx1), 1) - 1; % next letter idx
    message(i) = letters(idx2);    
end
message = strrep(message, '_', ' ') % replace underscore with space

message = 'aghesthif be ngole tthef is s y ms jup citoses in in winomaledwethe osther h e bams sthe he corithon'